| Severity of signs (Di) | |||||||
Symptoms | Total | X2 | ||||||
|
| Di0 | DiI | DiII | DiIII | No. | % |
|
Ai0 | No. | 298 | 362 | 63 | 00 | 723 | 72.3 | X2 = 36.68 |
% | 41.21 | 50.07 | 8.72 | 00 | ||||
AiI | No. | 40 | 84 | 38 | 1 | 163 | 16.3 | df = 6 P < 0.001*** |
% | 24.53 | 51.53 | 23.32 | 0.62 | ||||
AiII | No. | 9 | 58 | 32 | 15 | 114 | 11.4 |
|
% | 7.89 | 50.87 | 28.07 | 13.16 | ||||
Total | No. | 347 | 504 | 133 | 16 | 1000 | 100 |
|
% | 34.7 | 50.4 | 13.3 | 16.0 |